334 APPENDIX I 



The commercial values of manures are determined by means of the 

 units in the following manner : 



Take the analysis of the manure, and look for the following 

 substances : 



Phosphates dissolved (or soluble phosphate) ] 



Phosphates undissolved (or insoluble phos- / No other items but 



phate) . . . . > these are to be 



Nitrogen ( valued. 



Potash . . . . . . . . ) 



Should the analysis or the guarantee not be expressed in that way, 

 the chemist or the seller should be asked to state the quantities in 

 these terms. 



Suppose the manure is bone meal : 



An ordinary bone meal will contain about 50 per cent, phosphate 

 and about 3f per cent, nitrogen. The units for bone meal are 

 Is. 3d. for phosphate and 12s. Id. for nitrogen. Therefore the 

 value is 



s. d. 

 Insoluble phosphate, 50 times Is. 3d., 



equal to 326 



Nitrogen, 3| times 12s. Id., equal to .254 



Sa,y 5 1 10 per ton. 



Suppose the manure is dissolved or vitriolated bones : 

 It must be guaranteed *' pure." 

 The units in the schedule are 2s. 3d. for soluble phosphate, Is. 8d. 



for insoluble phosphate, and 15s. Qd. for nitrogen. 

 The analysis will be about 16 per cent, soluble phosphate, 18 per 

 cent, insoluble phosphate, and 2| per cent, nitrogen. In that 

 case the value would be 



s. d. 



Soluble phosphate, 16 times 2s. 3d., equal to 1 16 

 Insoluble 18 Is.Sd., 1 10 

 Nitrogen, 2| times 15s. Qd., equal to . .228 



Say .5 8 8 per ton. 



Suppose the manure is a superphosphate say an ordinary super- 

 phosphate, with 38 per cent, soluble phosphate and 2 per cent, 

 insoluble phosphate. It is valued thus 



